Gieysztoria dodgei (Graff, 1911) Ruebush & Hayes 1939

• Main Authors: Steenkiste, Niels Van, Gobert, Stefan, Davison, Paul, Kolasa, Jurek, Artois, Tom
• Format: Other/Unknown Material
• Language: unknown
• Published: 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Platyhelminthes; Rhabditophora; Rhabdocoela; Dalyelliidae; Gieysztoria; Gieysztoria dodgei; Greenland; Hayes
• Online Access: https://zenodo.org/record/6190533; https://doi.org/10.5281/zenodo.6190533

Gieysztoria dodgei (Graff, 1911) Ruebush & Hayes, 1939 (Figs. 6 D–F) syn. Dalyellia dodgei Graff, 1911 syn. Microdalyellia (Gieysztoria) dodgei (Graff, 1911) Ruebush & Hayes, 1939 New locality in the Nearctic. Richland, Kalamazoo County, Michigan, USA (42 ° 24 ’ 57 ”N, 85 ° 26 ’ 22 ”W). Cool, fast groundwater-fed creek entering into Little Long Lake. On private property, with a well-developed riparian zone: organic material in slower pools in the bend of the creek, where coarse sand and decaying hardwoods have accumulated (08/06/ 2009). Other localities in the Nearctic. Charlevoix? (Michigan, USA) (Woodworth 1896; Stringer 1951; see remark Table 1); Rochester (New York, USA) (Graff 1911); Kapsigdlit (Greenland) (Reisinger & Steinböck 1927); upper Mississippi Basin (Wisconsin and possibly other states, USA) (Higley 1918; Hayes 1942; Watermolen 2005). Material. One whole mount containing the stylets of two individuals and the bundle of spermatophores of probably one individual. This material was recovered from specimens kindly provided by Christopher Laumer (Harvard University, USA), but animals were unfortunately decaying when received at Hasselt University (Belgium). It appeared that one stylet belonged to an individual eaten by another, cannibalistic specimen. Other observations were impossible because of the advanced state of decomposition of the animals. Description and remarks. Although observations on live animals were impossible, the whole mount allows a relatively detailed study of the stylet morphology. The stylet is 135 µm long and consists of a proximal, 20 µmhigh, half open girdle (gi) and a distal, 115 µm-long tube (tu) surrounded by a partly-open, funnel-shaped sheath (sh) and flanked by a number of heteromorphic spines on both sides (Figs. 6 D–F). The girdle has a concave proximal edge and appears fibrous and reticulate. Proximally, the sheath is relatively broad and contains a large open window. At about halfway along its length, it becomes more narrow and closes around the tube. ...